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Intangible Assets - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]    
Amortization - intangible assets $ 150 $ 145
Amortization expense, next twelve months 88  
Amortization expense, year two 88  
Amortization expense, year three 88  
Amortization expense, year four 88  
Amortization expense, year five 88  
Land, transmission and water rights    
Finite-Lived and Indefinite-lived Intangible Assets [Line Items]    
Cost not subject to amortization $ 113 $ 117